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针对双蜗壳型式的海水淡化用提升泵,运用Fluent软件,分别采用标准k-ε、RNG k-ε和Realizable k-ε湍流计算模型进行数值模拟。分析3种不同湍流模型中蜗壳与叶片的流场情况,在此基础上进行了性能预测,并与试验结果进行比较。研究表明:采用RNG k-ε湍流模型计算时,中叶轮和蜗壳内部流线比较流畅,性能预测结果与试验结果吻合较好;采用k-ε和Realizable k-ε湍流模型计算时,叶轮和蜗壳流线紊乱、产生漩涡,性能预测结果与试验结果相差比较大。RNG k-ε湍流计算模型更适合海水淡化用提升泵和类似结构离心泵的性能预测,为海水淡化用提升泵及类似双蜗壳结构离心泵的性能预估和数值模拟提供一定参考。
For the double volute type seawater desalination pump, Fluent software was used to simulate the turbulence model with standard k-ε, RNG k-ε and Realizable k-ε, respectively. The flow field of the volute and the blade in three different turbulence models was analyzed. Based on this, the performance prediction was carried out and compared with the experimental results. The results show that when the RNG k-ε turbulence model is used, the flow lines inside the middle impeller and the volute are relatively smooth, and the performance prediction results are in good agreement with the experimental results. When k-ε and Realizable k-ε turbulence models are used, Volute flow turbulence, resulting in vortex, the performance prediction results and the test result is quite different. RNG k-ε turbulence model is more suitable for desalination pump and similar structure of centrifugal pump performance prediction, desalination for seawater desalination pump and similar double-volute centrifugal pump performance prediction and numerical simulation to provide some reference.